A cognitive psychologist wants to compare the reading comprehension scores of two independent groups of students: Group A (n=18n = 18n=18) who studied with background music, and Group B (n=18n = 18n=18) who studied in silence. The comprehension scores are measured on an interval scale, but the data is significantly skewed, meaning parametric assumptions are not met.
Which inferential statistical test should the psychologist use to analyse the difference between the two groups?
Wilcoxon Signed-Ranks test
Mann-Whitney U test
Unrelated t-test
Related t-test
644 exam-style questions on OCR A Level Psychology Research methods and techniques. Each one has a worked solution and a mark scheme showing where the marks go.